<!doctype html>
<html lang="en">
	<head>
		<!--  meta tags -->
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
		<!-- Bootstrap CSS -->
		<link rel="stylesheet" href="css/bootstrap.css">
		<style>
			div {
				border: 1px solid;
			}
		</style>

	</head>
	<body>
		<div style="background-color: lightgray;" class="clearfix"> 
			<div class="float-left px-3">左浮动</div>
			<div class="float-right px-3">右浮动</div>
		</div>
	</body>
</html>
